Modular block



FIG. 1 is a top perspective view of a modular block showing our new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top perspective view of a second embodiment of a modular block showing our new design;

FIG. 4 is a bottom perspective view thereof;

FIG. 5 is a top perspective view of a third embodiment of a modular block showing our new design;

FIG. 6 is a bottom perspective view thereof;

FIG. 7 is a top perspective view of a fourth embodiment of a modular block showing our new design; and

FIG. 8 is a bottom perspective view thereof. 

The ornamental design for a modular block, as shown. 